Materials Literature
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The arabinose-binding pockets of wild type AraC dimerization domains crystallized in the absence of arabinose are occupied with the side chains of Y31 from neighboring domains. This interaction leads to aggregation at high solution concentrations and prevents determination of the structure of truely apo AraC. In this…
Three Pd(II) complexes which are members of the same electron-transfer series have been synthesized. Refluxing of the reaction mixture containing equimolar amounts of PdCl(2), 2-(2-trifluoromethyl)anilino-4,6-di-tert-butylphenol (H(2)L(N,O)), 4,4'-di-tert-butyl-2,2'-dipyridyl ((t)bpy), and 3 equiv of triethylamine in…
Spectroscopic properties have been characterized for trivalent neodymium doped polycrystalline ceramic ytttria, Nd3+:Y2O3. The Judd-Ofelt [Phys. Rev. 127, 750 (1962); J. Chem. Phys. 37, 511 (1962)] analysis has been applied to the room temperature absorption spectrum to determine the radiative decay rates and branchin…
In this paper, a boundary value problem formulated previously by N. Swaminathan, J. Qu, Y. Sun, Phil. Mag. 2006 (this volume) is solved to obtain the defect, stress distributions in a planar electrolyte in solid oxide fuel cells. It is found that analytical solutions from the coupled theory reduce to the known results…
The thermal properties and their relationship to the charge transport properties of an electron-doped manganite La0.9Te0.1MnO3 were investigated. The resistivity and the Hall effect were measured. The magnetic-field dependence of Hall resistivity indicates that the carriers in La0.9Te0.1MnO3 are electrons. The thermop…
HypA is an accessory protein and putative metallochaperone that is critical for supplying nickel to the active site of NiFe hydrogenases. In addition to binding Ni(II), HypA is known to contain a Zn site that has been suggested to play a structural role. X-ray absorption spectroscopy has been used to show that the Zn…
The problem of radiation damage to cryo-cooled macromolecular crystals in intense synchrotron beams has entered the mainstream of macromolecular crystallography (MX) during the last few years. A growing body of researchers worldwide are now carrying out systematic investigations into different aspects of this problem.…
It was demonstrated that polypyrrole (PPy)/TiO 2 coaxial nanocables with a controllable sheath size were prepared, assisted by sodium dodecyl sulphate (SDS) surfactant through in situ chemical oxidation polymerization in aqueous solution. The synthetic strategy involved three steps. (1) TiO 2 nanofibres were prepared…
Thermolysis of {(n-C4H9)4N[MnIICrIII(C2O4)3]}n, 1 at 500 °C for 10 h gives spinel Mn1.5Cr1.5O4 which was characterized by powder XRD, SEM, FTIR and elemental analysis. The thermal conversion occurs by an internal redox process at ca. 400 °C in one step (TGA). It offers an alternative molecular source for an intermetal…
The adsorption kinetics and the adsorption isotherm of poly( N -isopropylacrylamide) (PNIPAM), in its stretching state, on a gold surface have been studied using a quartz crystal microbalance with dissipation monitoring (QCM-D). The adsorption process exhibits an exponential behavior following a concentration change i…
A new brownmillerite-type compound Sr2Al1.07Mn0.93O5 was synthesized. The crystal structure was determined using electron diffraction and high resolution transmission electron microscopy and refined from X-ray powder diffraction data (space group Imma, a = 5.4358(1) Å, b = 15.6230(4) Å, c = 5.6075(1) Å, RI = 0.036, RP…
Nanocyrstalline LaGaO3 and Dy3+- and Eu3+-doped LaGaO3 were prepared through a Pechini-type sol-gel process. X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), photoluminescence, cathodoluminescence spectra, and lifetimes were utilized to characterize the samples. XRD reveals that the sampl…
The selective catalytic reduction of nitrates (NO3-) in pure water toward N2 formation by the use of gaseous H2 and in the presence of O2 (air) at 1 atm total pressure and 25 degrees C has been investigated over Pd-Cu supported on various mixed metal oxides, x wt % MO(x(/gamma-Al2O3 (MO(x) = CeO2, SrO, Mn2O3, Cr2O3, Y…
Effects of multi-walled carbon nanotubes (MWCNT) and single-walled carbon nanotubes (SWCNT) functionalized with and without carboxylic groups on polymerase chain reaction (PCR) and restriction digestion reaction were investigated. The results showed that CNT can reduce and even inhibit PCR and restriction digestion re…
Time-resolved in situ SANS investigations have provided direct experimental evidence for the three initial steps in the formation of the SBA-15 mesoporous material: an induction period is followed by a shape transformation of the micelles from spherical to cylindrical ones followed by the precipitation of a two-dimens…
Density functional theory (DFT) calculations were carried out to describe the molecular structures, molecular orbitals, atomic charges, UV-vis absorption spectra, IR, and Raman spectra of bis(phthalocyaninato) rare earth(III) complexes M(Pc)(2) (M = Y, La) as well as their reduced products [M(Pc)(2)](-) (M = Y, La). G…
The formation of silicon nanocrystals (Si-ncs) and their room temperature photoluminescence (PL) properties were investigated in samples elaborated by the evaporation method. Silicon oxide (SiO) single layer and SiO∕SiO2 multilayers with different SiO layer thicknesses from 1to5nm were prepared and annealed at differe…
Surface effect on the longitudinal and flexural wave propagation in straight nanofibers/nanowires is studied within the framework of continuum mechanics. Modified Euler-Bernoulli and Rayleigh-Love rod equations and modified Timoshenko beam equation were developed to take into account the surface effect. It was found t…
By using the Ph- and Al-functionalized MCM-41 (Ph–Al-MCM-41) as a support, a new and powerful Pd/Ph–Al-MCM-41 catalyst was designed and used in iodobenzene (Ar–I) Ullmann coupling reaction with the attempt to develop new routes of clean organic synthesis by using water instead of organic solvents as the reaction mediu…
During diffraction experiments even cryo-cooled protein crystals can be significantly damaged due to chemical and physical changes induced by absorbed X-ray photons. The character and scale of the observed effects depend strongly on the temperature and the composition of crystals. The absorption of radiation energy re…